Gallery
Most pictures should be available somewhere in the gallery.
The archived gallery might not work, but all images are mirrored here in the same categories, so you should be able to find what you are looking for.
E.g. http://archive.is/4mIAY is filed under Concept Art/Images and the same picture with the Leonard Boyarsky story underneath it can be found in the current gallery under Fallout 1 -> Concept Art/Images, specifically at http://www.nma-fallout.com/gallery/photos/fallout-tales-2-sketch.2489/